To allow boats and other vessels to pass through even when their height is greater than the height of the bridge.
The middle of the bridge opens to let boats pass
No it doesn't. Tower Bridge can open to let boats pass under it.
It opens into the Indian ocean
it is called a draw bridge
Tower Bridge is the only bridge in London that opens.
No. The only bridge in London that opens is Tower Bridge, which is the next bridge downstream and is sometimes mistakenly thought of as London Bridge by tourists.
The bridge opens for boats. The engineer in charge would open it.
It's certainly the tallest and is the only bridge which opens to allow large vessels to pass underneath it.
The bridge opens to allow tall ships to pass under it.
Tower Bridge - the nearest to the sea and the entrance to the Pool of London
9pm it opens
Tower Bridge opens an average of two or three times per week.